Scientists Uncover Galaxy-Killer Wind in the Early Universe
Astronomers have long puzzled over a cosmic mystery. Early galaxies were expected to form stars rapidly. Yet many massive ones mysteriously stopped forming stars less than two billion years after the Big Bang. Now, researchers have found the answer. They discovered a powerful wind that halts star formation completely.
Caught in the Act
A new study provides the first direct evidence of this phenomenon. Rebecca Davies from Swinburne University of Technology led the research. The team published their findings on June 10 in the Monthly Notices of the Royal Astronomical Society. They focused on CRISTAL-02, a merging galaxy system observed just 1.1 billion years after the Big Bang.
Scientists combined data from the James Webb Space Telescope and the Atacama Large Millimeter/submillimeter Array (ALMA). They detected a massive cold gas plume extending 7 kiloparsecs. This wind moves at 640 kilometres per second. Moreover, it removes gas at twice the rate of star formation. As a result, the galaxy could lose all its molecular fuel in under 100 million years.
A Cosmic Chain Reaction
Supermassive black holes do not cause this wind. Instead, intense star formation triggers it. Merging galaxies create bursts of new stars. These galaxies form stars at three times the normal rate for their mass and era. Consequently, the biggest stars explode as supernovae. Their energy then drives powerful winds that blow gas out of the galaxy.
Mergers were common during this early period. In fact, about half of the massive galaxies experienced significant collisions. Therefore, such winds likely occurred frequently. This process explains why many galaxies died out so quickly in the young universe.
Why This Discovery Matters
The James Webb Space Telescope and ALMA worked together effectively. Their combined observations revealed details that were previously hidden. As a result, astronomers now understand one key reason behind the “dead” galaxies they observed.
This finding helps solve a long-standing puzzle in cosmology. It shows how galaxy mergers and supernova feedback shape galaxy evolution. Moreover, it offers new insights into the early universe. Researchers continue to study similar systems to confirm how widespread these killer winds were.
This breakthrough brings scientists closer to understanding how galaxies grow, live, and sometimes fade away in the cosmos.